Spanish to English Bus/Financial History

This term is from an article written in 1969 regarding international territorial waters and international agreements around use of water around a country's coasts, specifically regarding Equatorial Guinea and its colonizer Spain.

Source:
Tal zona contigua con precedentes en las "Hovering's Acts" de Inglaterra, los "liquor treaties" y en otros abundantes textos de represión fiscal, quedará superpuesta si, como antes señalamos, se fija un mar terriorial a todos los efectos, en las mismas 12 millas, pero es evidente que tal proceder internacional, está facilitando el problema y que España, con acertada visión, por lo menos en los más importantes aspectos, contribuye a su resolución.

I've researched hovering acts and liquor treaties. One liquor treaty in the US with UK described in 1926 in one article like this: "Therefore the purpose of the treaty was to preserve the rights of both nations on the high seas, and to give the ships of Great Britain the right to carry liquor into American waters under seal as sea stores, and to give to the United States the right to search and seize British ships beyond the old territorial limit"

Hovering acts "an act prohibiting or regulating the roving or hovering of domestic or foreign ships within certain limits especially : an act providing for the boarding of foreign ships and inspection of cargo manifests outside the three-mile limit (as within four leagues of the coast) in order to enforce revenue or security laws"

So both of these cited legal precedents involve increasing tax revenue for the state whose waters are being entered into. I'm having trouble finding Spanish references to "represión fiscal", except these recent articles from Mexico:
https://www.infobae.com/america/mexico/2020/09/19/muy-pertur...

I am not finding any English term like "tax repression", though "fiscal repression" does seem to be something that is NOT what is being described here.

Thanks for your help!